Perhaps you should try some spelling variations:
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dang xa » dang xay, lang xa, dang ha
su dang » su dung
cua tre » cua te, cuu tre, cua triet
va dau » va dao
ca dan » cac dan, ca dao
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) su dang xa hoi. hieu van chat xuc ((va dau) or (ca dan)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) su dang xa hoi. hieu van chat xuc ((va dau) OR (ca dan)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) su dang xa hoi. hieu van chat xuc ((va dau) or (ca dan)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) su dang xa hoi. hieu van chat xuc ((va dau) or (ca dan)) va cua tre*.